55 HELICID^S. 



anfractibus ternis, convexis, apertura elliptica. Hob. Rhode 

 Island. 



Succinea nutlalUana. Testa longo-ovata, obliqua, sub-nitida, 

 diaphana, striata, pallido-lutea ; spira sub-elevata ; suturis 

 impressis ; apertura longo-ovata. Hob. Oregon Territory. 



Succinea aurea. Testa obliquo-ovata, nitida, diaphana, lam, 

 aurea ; spira sub-elevata, suturis impressis ; anfractibus ternis, 

 convexis ; apertura ovata. Hab. Ohio. 



Succinea oregonensis. Testa obliqua, tenui, rugoso-striata, rufa 

 sub-diaphana ; spira exserta ; suturis valde impressis; an- 

 fractibus ternis inflatis ; apertura magna, lato-ovata. Hab. 

 Oregon Territory. 



Succinea inflata. Testa sub-rotunda, inflata, tenui, lactea ; spira 

 brevi ; suturis sub-impressis ; anfractibus ternis, sub-rotund- 

 atis ; apertura lato-ovata. Hab. South Carolina. 



Of these species we have seen S. wardiana, S. tot- 

 teniana, S. nuttalliana, and S. aurea; we have no 

 knowledge of the others except what we derive from the 

 descriptions and figures. On a careful examination of 

 these, it appears to us that S. aperta and S. aurea are 

 well-established species ; that S. wardiana is synonymous 

 with S. avara, Say ; 8. totteniana with 8. ovalis, Say ; 

 S. nuttalliana with S. ovalis, Gould ; S. inflata with 

 S. campeslris, Say ; that S. retusa is probably synonym- 

 ous with S. ovalisj Gould ; and that 8. oregonensis can- 

 not at present be ascertained. We cannot, however, 

 include 8. aperta, Lea, in this work, in consequence of 

 the rule we have adopted, not to insert any species which 

 we have not ourselves seen and examined. 1 



[ i In reference to the above synonymy it may be remarked, that 



